Chapter 4 · English Grammar
Modals
What you will be able to do
- Use modal verbs to show ability, permission, possibility and obligation
- Choose the right modal for advice, necessity and deduction
- Use 'have to', 'ought to', 'need' and 'used to' correctly
- Form and understand modal perfects (must have done, etc.)
- Avoid common modal errors
1 Quick Introduction
English
Modal verbs — can, could, may, might, will, would, shall, should, must, ought to — are helping verbs that add meaning: they show how possible, necessary, or advisable something is. They never change form (no -s, no -ing) and are always followed by the base verb: She can swim, not 'She cans swim'.
हिन्दी
सहायक क्रियाएँ / Modals — can, could, may, might, will, would, shall, should, must, ought to — ऐसी helping verbs हैं जो अर्थ जोड़ती हैं: ये बताती हैं कि कोई बात कितनी संभव, आवश्यक या उचित है। ये कभी रूप नहीं बदलतीं (न -s, न -ing) और हमेशा मूल क्रिया के साथ आती हैं: She can swim, न कि 'She cans swim'।
2 A Real-Life Situation
Imagine this
A few quick exchanges in a day:
Class: May I come in? — You may.
Road: You must wear a helmet.
Friend: You should see a doctor.
Why this form? Each modal carries a precise shade of meaning: may asks formal permission, must states a strong rule, should gives advice. Picking the right modal is the difference between sounding polite, firm, or merely suggestive.
3 The Grammar Rule
Rule & Formula
| Modal | Main use | Example |
|---|---|---|
| can / could | ability, permission | She can swim. |
| may / might | permission, possibility | It may rain. |
| must / have to | necessity, obligation | You must stop. |
| should / ought to | advice, duty | You should rest. |
| shall / will / would | future, offer, request | Shall I help? |
Modal + base verb (no 'to', except 'ought to' / 'have to')
He must go now; she ought to apologise; we can wait.
4 Ability, Permission, Possibility & Obligation
Each modal covers a few related meanings:
| Meaning | Modals | Example |
|---|---|---|
| Ability | can, could (past) | I can / could swim. |
| Permission | can (informal), may (formal), could (polite) | May I leave? |
| Possibility | may, might, could | It might snow. |
| Obligation | must, have to, should, ought to | You must wear a seatbelt. |
| Certainty (deduction) | must (positive), can't (negative) | He must be tired; it can't be true. |
must vs have to: 'must' is an inner/strong obligation; 'have to' is an external rule. mustn't vs needn't: 'mustn't' = it is forbidden; 'needn't' = it is not necessary.
1
Worked Example
Choose: You ___ (must / can) stop at a red light.
Solution
must — it is a strong obligation / rule.
2
Worked Example
Deduction: The lights are off; they ___ be out.
Solution
must — 'must' shows near-certainty (logical deduction).
Key Points
- can/could (ability, permission), may/might (permission, possibility)
- must/have to/should/ought to (obligation, advice)
- must = certainty (positive), can't = impossibility (negative)
5 Other Modals & Modal Perfects
A few more useful forms:
- need / needn't — necessity: You needn't worry.
- used to — a past habit no longer true: She used to live here.
- would — past habit or polite request: We would play here as kids; Would you help?
- shall — offers/suggestions: Shall I open the window?
Modal perfects = modal + have + V3. They talk about the past:
- must have done — certainty about the past: She's wet; it must have rained.
- should have done — criticism/regret: You should have called.
- could have done — an unrealised possibility: I could have won.
- might have done — a past possibility: He might have missed the bus.
1
Worked Example
Modal perfect: The ground is wet. It ___ (rain) last night.
Solution
must have rained — a confident deduction about the past.
2
Worked Example
Choose: You ___ (should have / must have) told me earlier. (criticism)
Solution
should have told me — it expresses criticism about something not done.
Key Points
- need/needn't (necessity), used to (past habit), shall (offers)
- Modal perfect = modal + have + V3 (talks about the past)
- must have = past certainty; should have = regret; could/might have = past possibility
6 Vocabulary Builder
| Word | Meaning | हिन्दी |
|---|---|---|
| Modal | a helping verb of meaning | सहायक क्रिया |
| Obligation | a duty or must | बाध्यता |
| Permission | being allowed | अनुमति |
| Deduction | a logical conclusion | निष्कर्ष |
| Advice | a suggestion | सलाह |
✎ Vocabulary Quick Test0 / 1
Q.Which modal best gives advice?
Explanation: 'should' (and 'ought to') is used for advice.
7 Common Mistakes to Avoid
✗ IncorrectShe cans swim.
✓ CorrectShe can swim.
Modals never take -s.
✗ IncorrectHe must to go.
✓ CorrectHe must go.
After most modals, use the base verb without 'to'.
✗ IncorrectYou mustn't worry, it's optional.
✓ CorrectYou needn't worry, it's optional.
'needn't' = not necessary; 'mustn't' = forbidden.
✗ IncorrectYou should called me.
✓ CorrectYou should have called me.
Modal perfect = modal + have + V3.
8 Practice Exercises
Fill in the BlanksLevel 1
Choose the best modal.
- ______ I borrow your pen? (polite permission)
- You ______ wear a helmet on a bike. (obligation)
- You ______ see a doctor. (advice)
- She ______ speak three languages. (ability)
- It ______ rain later. (possibility)
Answer Key
- May / Could
- must
- should
- can
- may / might
Fill in the BlanksLevel 2
Complete with a modal or modal perfect.
- The streets are wet; it ______ (rain) last night.
- You ______ (worry); everything is fine. (not necessary)
- She ______ (live) here as a child, but she moved away.
- You ______ (tell) me earlier! (criticism)
- ______ I carry your bag? (offer)
Answer Key
- must have rained
- needn't / don't have to
- used to live
- should have told
- Shall
Error Detection
- He can to drive.
- She musts finish it.
- You should have come yesterday but you didn't, you should came.
- It is raining, you mustn't take an umbrella if you don't want to.
Answer Key
- He can drive. (error: to)
- She must finish it. (error: musts)
- You should have come yesterday. (error: should came)
- It is raining, you needn't take an umbrella if you don't want to. (error: mustn't)
Sentence Correction
- Can you to help me?
- You must to wear a uniform.
- He must has missed the train.
Answer Key
- Can you help me?
- You must wear a uniform.
- He must have missed the train.
Rearrange the Words
- swim / she / can / well
- helmet / you / wear / must / a
- have / told / should / me / you
Answer Key
- She can swim well.
- You must wear a helmet.
- You should have told me.
Match the Following
| Column A | Column B |
|---|---|
| 1. can | a. advice |
| 2. must | b. ability |
| 3. should | c. past certainty |
| 4. must have done | d. obligation |
Answer Key
can → abilitymust → obligationshould → advicemust have done → past certainty
9 Micro Quiz
✎ Quick Check — 5 questions0 / 5
Q1.'She ___ swim when she was five.' (past ability)
Explanation: Past ability → 'could'.
Q2.Which shows obligation?
Explanation: 'must' shows obligation.
Q3.'You ___ told me!' (criticism about the past)
Explanation: Modal perfect 'should have' shows regret/criticism.
Q4.'___ I help you?' (offer)
Explanation: 'Shall I …?' makes an offer.
Q5.Correct form:
Explanation: Modal + base verb, no 'to'.
10 Reading Practice
"You must submit the project by Friday," the teacher said. "You should start today, and you may ask me for help. You needn't print it in colour — black and white is fine. If your file is missing, you must have deleted it by mistake; you should have made a backup. You could have used the cloud."
Comprehension Questions
- Which modal shows a strong obligation, and which gives advice?
- Explain the meaning of 'You needn't print it in colour.'
- What does 'you must have deleted it' express?
Answer Key
- 'must' (must submit) shows obligation; 'should' (should start) gives advice.
- It is not necessary to print in colour — 'needn't' = no obligation.
- A confident deduction about the past (near-certainty) using the modal perfect.
11 Speaking, Writing & Daily Use
Say these aloud
- May I come in, please?
- You must finish your homework first.
- You should drink more water.
- She can play the piano beautifully.
- It might rain this evening.
Write five sentences of advice and rules for a new student, using must, should, can, may and needn't.
Example: You must reach by 8. You should keep your ID. You can use the library. You may ask any teacher. You needn't bring lunch on Fridays.
12 Challenge Zone
🔥 Higher-Level Questions — 30 / 3
Q1.Choose the correct meaning: 'You mustn't park here.'
Explanation: 'mustn't' = prohibition (forbidden).
Q2.Which modal perfect fits? 'I'm not sure, but he ___ missed the bus.'
Explanation: 'might have' shows an uncertain past possibility.
Q3.Choose the correct sentence.
Explanation: 'needn't' is a modal → base verb 'come'.
13 Chapter Mind Map
MODALS
|
+--------+---+----+---------+
| | | |
ABILITY OBLIGATION ADVICE MODAL
can/could must/have should PERFECT
PERMISSION to ought to modal+
may/can POSSIBILITY DEDUCTION have+V3
may/might must/can't (past)14 One-Minute Revision
Remember these
- Modals + base verb (no 'to', except 'ought to'/'have to'); never take -s
- can/could (ability, permission), may/might (permission, possibility)
- must/should/ought to (obligation, advice); must/can't (deduction)
- mustn't = forbidden; needn't = not necessary
- Modal perfect = modal + have + V3 (talks about the past)